Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Performance of Laser Distance Sensors Ralph M¨ uller February, 13 th 2015 IMPRS PPSMC LS Schaile Ludwig-Maximilians-Universit¨ at-M¨ unchen February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 1 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Table of Contents Motivation for ATLAS NSW Upgrade 1 Micromegas and sTGC Detectors for the NSW Upgrade 2 Principle of Topology Measurements 3 Performance of the Panasonic HLG-112-S-J 4 Performance of the microEpsilon ILD2300-20 5 Summary and Outlook 6 February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 2 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Atlas Detector Atlas Detector 2018: New Small Wheel February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 3 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Trigger Isue 1 all L1 MU11 Triggers (10 GeV muons) 2 reconstructed tracks with Level 1 Trigger Rate P T > 3 GeV 3 reconstructed tracks with P T > 10 GeV homogeneous distribution 90% false triggers in endcap region ( | η | > 1) Extrapolated rate of L1 MU20: 60 kHz for design luminosity L = 10 34 Close to bandwidth limit: 100 kHz February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 4 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Reasons for High Trigger Rate Sofar only Big Wheel included in L1 trigger including angular 1/4 of ATLAS detector information After reconstruction a currently good µ -trigger in Big Wheel can be: A Track pointing to IP Correct muon track B No hit in Small Wheel e.g. proton faking muon C Track not pointing to Interaction Point e.g. background event February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 5 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Reasons for High Trigger Rate 1/4 of ATLAS detector Idea False triggers can be sorted out by including the Small Wheel in the Level 1 trigger. ⇒ Upgrade of the Small Wheel, ∆ θ ≤ 1 mrad February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 5 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook New Small Wheel Assembly Sectors of NSW disklike structure: eight large sectors eight small sectors Each sector subdivided into two detector units Detector unit: two quadruplets of MM and sTGC each trigger: eight layers of sTGC precision: eight layers of Micromegas SM2 to be built at LMU February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 6 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Working Principle of Micromegas Detectors Sketch of a MM Detector electronic single strip readout measure charge center σ < 50 µ m need of a precise readout plane pitch planarity drift gap amplification gap February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 7 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Achieved Resolution Resolution of Micromegas (Bortfeld, 2014) (50 × 50 cm 2 MM, 120 GeV Pions, H6-Beamline CERN, perpendicular beam) February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 8 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook MM Construction as quadruplets 1 quadruplet = 5 sandwhich Sketch of a MM Quadruplet panels Panel size ≈ 2 m 2 (SM2) Planarity requirement 80 µ m over 2 m 2 About 160 surfaces to measure Measurment duration / panel: Tactile: ≈ 8 h Laser: ≈ 1 h February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 9 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Sectors of the New Small Wheel Red and Blue: sTGC’s: small strip Thin Gap Small and large sector Chambers for trigger Orange and green: Micromegas: micromesh gaseous structure for precision coordinate Structure of a single sector: one module sTGC one module Micromegas one module Micromegas one module sTGC February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 10 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Sectors of the New Small Wheel Small and large sector SM2: three readout boards per readout plane 1024 strips each 0.45mm pitch alignment requirement: 20 µ m / 2 m = 10 − 5 February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 11 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Glueing Process Steps of the glueing process Two step glueing process Need precision needed during glueing Need to monitor the glueing process using the stiffback February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 12 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Glueing Process of a Prototype Glueing the first side Glueing the second side February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 13 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Assembly of Four Mechanicle Prototypes in Freiburg Mechanicle Prototype in Freiburg February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 14 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Planarity Measurment Freiburg - Tactile CNC - Measurment Freiburg Sensor of CNC Machine CNC coordinate measurment system Topology Measurement of all five panels February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 15 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Result of Planarity Measurment in Freiburg Topology of a Panel Grid visible 15 µ m structure included intentiully for diagnostics ⇒ Planarity OK Edge effects outside active area February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 16 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Laser Distance Sensor Using Triangulation Scheme of Triangulation Known constants: a , a ′ , δ According to the scheme one gets α = 90 ◦ − δ − β ≡ δ ′ − β (1) tan β = x (2) a sin α = sin β (3) a ′ z Using (1), (2) and (3) one obtains z = x · a ′ 1 a · a cos δ ′ (4) sin δ ′ − x February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 17 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Available Sensors Panasonic HLG-112-S-J microEpsilon ILD2300-20 Results obtained with both sensors mounted on a vertical translator will be displayed in the following slides February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 18 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Comparison between Laser Sensor and Reference Measurement 50 × 54 cm 2 panel Differences caused by permanent quad. panel quad. panel (ref) deformation Time between measurments ≈ 0 . 5 a Laser based topology measurement seems aplicable February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 19 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Semitransparent Surfaces measurable using Panasonic? Granite table as reference surface Four line measurements along Measurement of Granite Table identical line: Granite table: contains semitransparent crystals Kapton foil: 20 µ m semitrsparent Aluminum: rough surface Teflon: smooth non transparent surface ⇒ Panasonic sensor not suitable for semitransparent surfaces February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 20 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook microEpsilon Sensor Spot size 40 × 40 µ m 2 specular reflection measurment mode (for semiransparent surfaces) 40 mm working distance ± 10 mm February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 21 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Topology of Calibration Profiles Profile 1 Profile 2 Profile 3 Machined Aluminum Profile Possibility to measure very small deviations. February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 22 / 25
Motivation Upgrade Topology HLG-112-S-J ILD2300-20 Summary and Outlook Sag of Aluminum Profile against Granite Table Measurement of Granite Table Residuals of Granite Table Visible bending of aluminum profile Deviation from parabolic fit ⇒ additional non planarity granite surface imperfection in alu profile Overall planarity: σ = 4 . 6 µ m February, 13 th 2015 Ralph M¨ uller Performance of Laser Distance Sensors 23 / 25
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